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Ubuntu 26.04 LIBNFS High NFS Service Disruption USN-8464-1

LIBNFS could be made to crash or run programs if it connected to a specially crafted NFS server.. ========================================================================== Ubuntu Security Notice USN-8464-1 June 23, 2026 libnfs vulnerability ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 26.04 LTS - Ubuntu 25.10 - Ubuntu 24.04 LTS - Ubuntu 22.04 LTS Summary: LIBNFS could be made to crash or run programs if it connected to a specially crafted NFS server. Software Description: - libnfs: NFS client library Details: It was discovered that LIBNFS incorrectly handled certain string sizes when connecting to an NFS server. An attacker could use this issue to cause LIBNFS to crash, resulting in a denial of service, or possibly execute arbitrary code. Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 26.04 LTS libnfs-utils 5.0.2-1ubuntu1.1 libnfs14 5.0.2-1ubuntu1.1 Ubuntu 25.10 libnfs-utils 5.0.2-1ubuntu0.25.10.1 libnfs14 5.0.2-1ubuntu0.25.10.1 Ubuntu 24.04 LTS libnfs-utils 5.0.2-1ubuntu0.24.04.1 libnfs14 5.0.2-1ubuntu0.24.04.1 Ubuntu 22.04 LTS libnfs-utils 4.0.0-1ubuntu0.1 libnfs13 4.0.0-1ubuntu0.1 In general, a standard system update will make all the necessary changes. References: https://ubuntu.com/security/notices/USN-8464-1 CVE-2026-53689 Package Information: https://launchpad.net/ubuntu/+source/libnfs/5.0.2-1ubuntu1.1 https://launchpad.net/ubuntu/+source/libnfs/5.0.2-1ubuntu0.25.10.1 https://launchpad.net/ubuntu/+source/libnfs/5.0.2-1ubuntu0.24.04.1 https://launchpad.net/ubuntu/+source/libnfs/4.0.0-1ubuntu0.1 . LIBNFS must be updated to address a critical denial of service risk connected to malformed NFS servers on Ubuntu.. Ubuntusecurity, LIBNFS update, NFS client security, denial of service, critical vulnerability. . Severity: Critical. LinuxSecurity.com Team

Jun 23, 2026 •Critical Ubuntu